Futaba Miyamizu (宮水 二葉,Miyamizu Futaba?) is Toshiki's wife and Mitsuha's and Yotsuha's late mother. She is Hitoha's daughter as well. She was a shrine maiden for the Miyamizu family's traditions, and a very loving mother and wife, but she unfortunately died at a young age.

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Futaba was noted to be a very beautiful woman. Her daughters look almost identical to her and inherited her beauty. She had straight, shoulder-length black hair which she left loose, but sometimes had it tied into a low ponytail when performing Miyamizu traditions. Futaba had brown eyes.

Futaba seemed to be a very kind and caring woman. She was a very loving mother towards Mitsuha and Yotsuha and loved her husband deeply. Before her death, she was very sad to leave her family behind and apologized to them.

Futaba is the daughter of Hitoha Miyamizu. As a Miyamizu, Futaba was trained to become a shrine maiden. She also had dreams when she was a young girl ― dreams about someone else's life ― like her mother and eldest daughter. At an unknown point in her life, Toshiki came to Itomori for research and met Futaba. They eventually married and had two daughters, Mitsuha and Yotsuha.

Futaba on her deathbed.

Since Toshiki was married into the family, both he and Futaba were active in the Miyamizu traditions. However, after Futaba died of sickness, her husband was grief-stricken and left the family's shrine because he said he only loved Futaba and not the Miyamizu shrine. He left then to pursue politics and since then, Mitsuha and Yotsuha have lived with their grandmother.